Best used amp $750 range

The Bryston is a good pick. I'd also encourage you to listen to a Hafler 9270. It is a NICE sounding amp with many of the same characteristics of the Bryston - quick and very warm sounding for SS. Ultimatley, you will want to get an amp that will match well with whatever preamp you are considering. Good luck.

Rouge 88 will run 800/900 used.you will never need anything more.

Since you specified a used preamp around $750, I'm amazed that no one has listed the Adcom GFP-750. It's often sold used for $800-900, and is listed as a "Class A" recommended component by Stereophile. Even cheaper used is the Adcom GFP-565, which was a stunningly good preamp that now sells for $350-400. I owned the GFP-565 for a number of years, and it trounced a lot of preamps selling for up to $2K.

i pitty the fool who sells his classe pre and doesn't just buy a used classe audio seventy or fifteen to go with it.

A Threshold 400a or Forte model 4 for solid state. In Tubes, Cary Audio SLA70 or New York Audio Labs Moscode 300.